Project server 2013 installtion problem

Project server 2013 and i found the following issue…It’s saying that some previous version of this product is installed while i

am trying to install project server 2013 ,which is a prerequisite for integration component(synchronization service for Microsoft project server) in AX 2012 r2 .How to solve this ?

tried to install that and

The error says that you have a previous version installed and you have to decide whether you want to upgrade or to uninstall the previous version. What else do you want to hear from us?

Also, note that this is not a forum about Microsoft Project Server. You’ll find one here.